Saw-filing clamp.



H; l. DAVlS.-

SAW FILING CLAMP. APPucATloN FILED APR.13.1917.

Lmm, mmm A151223, 1918.

HU .DPMS

Emmi? JEEEEason nayis, E waYEEsBono, GEORGIA.

SAW-FILING CLAMP.

To all whom t mag/concern:

v Be it known that I, HENRY JEFFERSON DAvis, a citizen of the United States, residing at Waynesboro, in the county oi yBurke and Stateof Georgia,have invented certain new and useful Improvements in Saw-Filinglamp-s, of which the Jfollowing j v is aspecification,referencebeing had to the accompanying drawings. Vl`h1si1nvent1von,relates to saw clamps, and

particularly to clamps for holding a saws.

whileitisjbeingfled. j v

Clamps of this character usually have a 1number of objectionable features. j For one thing, the `saw trembles while the teeth are being filed, because the clamp is not suiiiciently solidly supported.' For another thing, the saw clamps `donot act to firmly clamp saws having different thicknesses, and Y for another, there is no means of guiding .the file in lines diagonal to the plane of the saw `or at right angles to the plane of the saw. Thus the filing of the teeth is not accurately done. i

The general object of my invention is to provide a saw clamp of a` very simple form which maybechea-ply made, and which is so constructed as to be entirely rigid when `fastened down upon a bench or other supporting member. j

A. further object is to provide upon the face of one member of the saw clamp, guiding lines extending in reverse diagonal directions relative to each other and to the sawV blade when ,it is clamped and guiding lines extending at right angles to the saw `blade when it is clamped, these lines, which may be in the form of ribs, grooves or lines A further object is to so form onev clamping member of the saw clamp of` material which will have a slight spring and 'form the iace of thismember, where it confronts the face of the other member, with a slight curve so that when the clamps are brought Ytogether the middle portions of the movable clamp will iirst en age the sawy and thenthe end portions will e drawn inward against the resilienceof the material, and will firmly Vclamp upon the saw blade, thus securing the resilient clamping action.` j j Still another object is rto so construct the Specification of Letters Patent.

n Y Other objects clamping members that a three point, or, as it may be termed, a three edged bearing will be secured for the saw blade between the clamping members.

\ `Still anotherobject is to provide improved means for drawing the movable clamping member against the body clamp I Patented Apr. 2.3, 191.. Application filed April 13, 191'?. `Serial No. 161,859.

to `gripthe saw between the clamping jaws j j and Vanother object is to j so construct the clamp that` the body, member may be rigidly fastened down upon the workbench'or other support.

the following description.

` My invention is illustrated in panying drawings, wherein ;f-

Figure 1 is a toplplan view ofmy im.-

the` accomwillappear in the` course of proved clamp, the jaws `of the clamp being 1 open;

. F ig. 2 is an end elevation showing the table on which Vthe clamp is mounted in section; j l

F ig. 3 is a sectional view of the clamp midway between its ends;

F ig. 4tk is a section on the line lf-4 of Fig 3;

Fig.

5 is section on the line 5-5 of Fig. 3.

Referring to these drawings, 10 designates 16. This clamping cam or eccentric has a curved handle or arm 17 attached to it and is` perforated for the passage of a screw, pin or other suitable equivalent member' 18. The plate, constituting the member 10, is

formed at a plurality oi points with openings 19 through which screws may be passed to hold `the plates solidly down upon a bench or other supporting table, with'` the downwardly extending flange 11 abutted against the edge of the table soth'at the plate will be particularly solid., The plate forming the member 10 is also cut away as at 2O at its ends to accommodate thecam 16. The edge 22, which constitutes the other jaw of the.

cla-mp. This bar on its inner face is'longitudinally -bowed .outwardas atv 23. This longitudinal curve is relatively slight.` Vertically the face 23 is downwardly curved or rounded7 as seen from Fig. 3. The upper face of this member '22 is slightlyv below the flange 12 so'fthat the saw disposed between the members 10 and 22 will be clamped .at three points, as indicated clearly in Fig. 2.

VThe movable jaw 22 has attached to its ends the inwardly extending slides or arms 24, each of these slides just inward of .the point of attachment of the bar orclamp1ng member 22 bein'grecessed, as at 25. These slidingmembers 24 slide in grooves 26, or any other suitable guideways, and, of course, are held down lirmly upon the mem ber 10 by-theoverhanging flanges 14. The cams 16 are attached to these sliding Aarms 24 by means of screws or pins 18 and it will be seen that these cams exert camming action against lthe shoulders 27 formed'by cutting away the end walls 13,' as at 15.

The face of the plate forming the-member 10 is provided with a plurality of spaced lines @extending at right angles to the length of the clamps 10 and 22, with a plurality of lines bl extending parallelV to each other ,diagonallyto the line of the saw when clamped', `and a plurality of lines 0 also extendingdiagonally to the plane of the saw when clamped, butextending in Yan opposite direction to the lines Z). VvThese linesa, b and c are guides whereby the 'operator may judge if he is holding vthe ltile prop- -erl'yfin order to make the proper direction of cutin the saw teeth. Inrip cut saws and meat saws, the teeth are sharpened by driv ing the file at right angles to the plane of the teeth but other forms of'saws are sharpened by disposing the'iile at an angle `to the plane of the teeth. and these angles are fully kindicated by the lines a, Z) and c. These lines may be formed by upwardly extending ribs,by grooves cutin the Jface ofthe plate or vby lines scratched or etched across the face of theplate.'

' Tn the .useofthis device, the blade of the saw is .extendedv upward between the clamping member 22 and the clamping member 10 and then the clamping member 22A is drawn toward the clamping member 10 by rotating the cams 16. The middle portion of the member 22 will strike the saw first yand then asthe cams are `further rotatedthe end portions of the clamping member 22 will bedrawn inward thus causing the member 22tol'exert a resilient bindingaction described formed of a plate adapted to be attached cannot .occur because the plate 10 is firmly held down upon the work bench with its jaw edge, through the medium of the llange 11, abutted firmly against the edge of the bench. Inasmuch as the saw is gripped along three lines coinciding with the upper and lower edges of the clamping face of the plate 10 and the edge of the clamping mem- -ber 22, it will be held very iirm'ly. My device is ver57 simple, it is extremely cheap, may be readily applied in all sorts ofsituations and I have found it very el'ective in practice. y f

Having described Amy invention, what I claim is -1. vIn asaw clamp, a body member adapted vto be attached to va bench or other support and forming one jaw of a clamp, a second clamping member confronting the edge of the body member and having arms' slidably engaging with the member, said second named member having its inner edge face slightly convex longitudinally and the second named clamping member being slightly resilient, and means engaging the arms and mounted upon the body member for ladjusting said clamping member toward or from the body member.

2. saw tiling clamp of the character comprising a body member to a bench or ot-her support, a clamping member slidingly mounted on the plate movable toward or Jfrom the plate, and means for adjusting the clamping member, the kface of the plate being formed with le guiding lines, said lines extending Vat evenly spaced distances across the entire face of the plate, a certain series of lines extending Vat right angles to the edge of the plate, a

second series extending diagonally to the edge of the plate, and a third series extending diagonally to the edge of the plate but at an inclination to the second named series.

3. A saw tiling clamp comprising a plate having .a downwardly extending edge flange, the plate being adapted to be attached'to a bench, the ends of the plate'bcing formed with upwardly extending end walls, said end walls having overhanging flanges and being 'interrupted im their length, a clamping member movable toward or from said plate and -having inwardly extending arms at its ends, extending beneath the inwardly extending iianges on the end l lV (l Walls and slidable in guideways formed in In testimony whereof I hereunto @LK my the plate7 and cams disposed in the intersignature in the presence of two Witnesses. luptecl portions of said end Walls and bear- T ing against the end faces 0f said end Walls HEB RY JEFFERSON DAVIS' and pvotally connected to said arms, said Vitnesses:

Cams having opemtive handles extending F. B. WRIGHT, therefrom. M. R. WILSON.

Copies of this patent may be obtained for ve cents each, by addresing the ommiseiomer ml Mmmm, Washingtom. D. C. 

